I'd wager (heh) a bit of both. The distinction isn't that the affluent neighborhood gets to make its own decisions or be cared about by large corporations whose presence ostensibly enhances their quality of life, it's that poor neighborhoods don't. The reason the latter have these socioeconomically deleterious establishments is the same reason they don't get grocery stores or gyms: the people making the decisions don't see them as customers to serve, but as marks to exploit. And suddenly we're back to the notion that privilege isn't necessarily having it "better," but sometimes just having what most would consider the dignified standard.